{
  "manageEntity": {
    "action": "Save",
    "entityId": "1638092061",
    "entityType": "Track",
    "nonce": "0x9f16ef67c778ba4dff42f97d25546d694ba907704694eb7d999d1a43638b64b7",
    "signature": "0x5b2b54953ed9bb396a4ed5d46f82591d5f4b1b27ba4c2ad4c14e3bcb815c973f4ad692f53873394d77f8287db6d5a6818ce9a1ae4e4a04c83b15629d840ae9301c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}